Metal Bat, real name Bad, holds the rank of 15th among the S-Class heroes in the Hero Association. His iconic appearance mirrors a Japanese delinquent, complete with a prominent pompadour, a black gakuran uniform layered over a red sweater, and his signature weapon: an unbreakable metal baseball bat. This specialized bat was commissioned by the Hero Association to replace the standard metal bats he routinely shattered in combat. He possesses an exceptionally fiery temperament and a reckless nature, speaking with rough dialect that substitutes words like "your" for "yer." Metal Bat radiates unwavering confidence, openly dismissing the danger posed by Demon or Dragon-level threats. This brashness often triggers immediate, forceful action, exemplified when he destroyed one of Melzargard's marbles without analysis during the Alien Invasion. Beneath this aggressive exterior lies a deeply caring core, fiercely protective of his younger sister Zenko and his pet cat Tama. Promises to Zenko supersede hero duties, leading him to refuse harming Garou in her presence due to a vow against displaying violence around her. He also demonstrates unexpected consideration for civilians and property during fights, such as catching food before it hit the floor during a monster attack and adhering to establishment rules. His primary combat ability stems from "Fighting Spirit," a unique power that exponentially amplifies his strength, speed, durability, and reflexes as he sustains damage and his anger intensifies. This power theoretically grants "infinite potential" under ideal conditions, enabling confrontations with high-level Dragon threats. However, the boost is temporary, rapidly diminishing post-fight and leaving him vulnerable in his base state. Creators ONE and Yusuke Murata confirmed that without Zenko's intervention, his final swing against the Dragon-level Garou would have been lethal. Conversely, his reliance on accumulating damage to reach peak power makes him vulnerable to swift, overwhelming attacks aimed at immediate elimination. Despite low intelligence stats in official materials, he displays sharp tactical awareness in battle, identifying weaknesses like Elder Centipede's soft spot and countering Rafflesidon's sleep gas. Key battles highlight his capabilities and limitations. He defeated monsters such as Senior Centipede and Rafflesidon, though he often eliminated them before interrogation, a trait shared with Saitama. His fight against the Dragon-level Elder Centipede was interrupted by Garou. Their subsequent brutal duel, where Garou exploited his injuries, halted solely due to Zenko's intervention. Following the Monster Association battle, he departed the Hero Association and joined the Neo Heroes. He infiltrated their ranks alongside Sekingar and Isamu, serving as Sekingar's bodyguard to expose McCoy's schemes, demonstrating his willingness to operate outside traditional hero structures for perceived greater justice. He harbors disdain for the wealthy, particularly Hero Association investors, resenting bodyguard duties for figures like Narinki and his son Waganma, though he still protected them from threats like Senior Centipede. Additional defining details include his hobbies, notably attending Zenko's piano recitals. His dislikes encompass inconsiderate people, braggarts, and chores. He was a problematic student known for creative cursing. The series creator stated his participation could have altered the outcome of the Monster Association battle.